Supercapacitor Separator Patents: Leaders & White Space 2026
A data-led look at supercapacitor separator patents: who holds the most families, how filings have trended since 2017, and where under-claimed branches remain open.
Filing growth = 2021 (10 records) → 2024 (13); 2024 is the last year we treat as complete. Top-5 share = the 5 largest assignees ÷ all 270 records in scope (CR5), not the ranked leaders only.
What the supercapacitor separator patent record shows
Supercapacitor separators sit at the intersection of two crowded fields: capacitor construction under H01G and the broader electrochemical storage claims that dominate H01M. The 270 records in this dataset span 2015 through the 2026 cut-off, filed through national offices and the PCT route, and cluster around porous membrane structure, coating chemistry, and the graphene- and carbon-based materials that recur across the most-cited prior art. Interlayer spacing, coupled hybrid materials and cellular graphene films anchor the citation record, which signals where early foundational claims were laid rather than where filing is heaviest today.
Filing activity peaked in 2020 at 29 records and has since settled into a lower but still active band, with the most recent years understated because publication typically lags filing by around 18 months. The assignee ranking is dominated by a handful of universities and materials specialists at the top, but the presence of 100 ranked companies with most holding only a handful of families each points to a field still open to new entrants who pick a specific structural or chemical angle rather than trying to claim the separator broadly.
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Filing trends and technology composition
Two views of the same 270-record dataset: how filing volume has moved year over year, and which IPC subclasses the records also carry alongside the core H01G capacitor classification.
Filing trend, 2017-2026
Filings ran at 20 in 2017, rose to a peak of 29 in 2020, and grew 30% from 10 in 2021 to 13 in 2024 — the last year the dataset treats as complete. 2025 and 2026 figures (down to 3 in 2026) are undercounts caused by publication lag, not evidence of a slowdown.
Publication lags filing by roughly 18 months, so 2025 onwards are still filling in. Growth rates on this page therefore end at 2024; running them to the last bar would understate the field.
Technology composition by IPC subclass
Every record carries H01G by definition of the search. A quarter also touch H01M battery and cell classes (25.2% of the 270 records), meaning separator innovation is often filed alongside cell-level claims. Smaller but distinct clusters sit in inorganic compounds (9.6%), nanotechnology applications (5.9%), and coatings (4.4%), each large enough to represent a real sub-strategy rather than noise.
Shares are the percentage of the 270 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Supercapacitor Separator Patent Landscape with Eureka
This page is one run against one query. Ask Eureka your own question about supercapacitor separator patent landscape and every answer comes back with the patent numbers behind it.
Try EurekaThe records anchoring this field
US10396365B2 — Diatomaceous energy storage devices
The disclosed technology generally relates to energy storage devices, and more particularly to energy storage devices comprising frustules. According to an aspect, a supercapacitor comprises a pair of electrodes and an electrolyte, wherein at least one of the electrodes comprises a plurality of frustules having formed thereon a surface active material. The surface active material can include nanostructures, including one or more of a zinc oxide, a manganese oxide and a carbon nanotube.Filed by Avery Dennison Retail Information Services LLC, granted 2019-08-27.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20150103469A1 | Interlayer distance controlled graphene, supercapacitor and method of producing the same | 63 |
| 2 | US20130189580A1 | Strongly coupled inorganic-graphene hybrid materials, apparatuses, systems and methods | 58 |
| 3 | US9190667B2 | Graphene nanocomposites for electrochemical cell electrodes | 52 |
| 4 | US20030175494A1 | Porous composite product in particular with a high specific surface preparation process and electrode formed … | 52 |
| 5 | US20170178824A1 | Cellular graphene films | 36 |
| 6 | US20180212253A1 | Diatomaceous energy storage devices | 26 |
| 7 | US20170200565A1 | Supercapacitor having highly conductive graphene foam electrode | 26 |
| 8 | US20140098461A1 | Spacer-modified graphene electrode for supercapacitor | 24 |
| 9 | US20150162140A1 | Structural supercapacitor usable in a mechanical structure | 22 |
| 10 | US20140029162A1 | Conductive layered structure, electrode and supercapacitor comprising the conductive layered structure, and m… | 22 |
Citation counts favour older filings that have had more time to accumulate references within the searched corpus — read them as a signal of influence on later work, not as a ranking of current filing activity.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the concentration and citation data mean for filing strategy
Reading the ranking and the citation table together points to a field with a defined core and open edges — useful for deciding where a new filing has room to stand and where it will meet dense prior art.
A leader, then a fast-thinning field
The leading assignee holds 18 records, with the fifth-ranked at 10 and the tenth at 7. Combined, the top five hold 23.7% of all 270 records and the top ten hold 37.8% — concentrated enough to matter, but well short of a field controlled by a handful of players.
Real growth, not a spike
Filings rose from 10 in 2021 to 13 in 2024, a sustained 30% increase over the only three-year span the dataset treats as complete. The apparent drop in 2025-2026 reflects publication lag rather than a genuine pullback in filing activity.
Separator claims rarely stand alone
A quarter of the 270 records also carry a battery or cell classification, meaning many separator innovations are drafted as part of a broader cell or device claim rather than filed as a standalone separator patent. That has implications for freedom-to-operate searches, which need to look past H01G alone.
Collaboration is the exception
Only four co-assignee pairings appear across the dataset, the strongest linking a large electronics manufacturer with a research university at 12 shared records. Most filings in this field come from a single assignee acting alone.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to supercapacitor separator patent landscape, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Hon Hai Precision Industry Co., Ltd. (Foxconn) | Tsinghua University | 12 |
| The Regents of the University of California | LU YUNFENG | 2 |
| The Regents of the University of California | CHEN ZHENG | 2 |
| King Fahd University of Petroleum and Minerals | KING ABDULLAH CITY FOR ATOMIC & RENEWABLE ENERGY K A CARE | 1 |
The strongest co-assignee link pairs a major electronics manufacturer with a research university across 12 shared records — the kind of pairing worth tracking if you are scouting for licensing or joint-development partners in this space.
Where to take this analysis
The dataset points to a field with defined leaders and open structural niches. The next steps depend on whether you are clearing a filing or scouting where to stake a claim.
Map freedom-to-operate against the top holders
Start with the assignees holding the densest citation clusters around graphene and hybrid materials structures before drafting claims in that space.
Explore assignee claims in EurekaTrack the cross-class overlap with H01M
Because a quarter of records also sit in battery and cell classes, a separator-only search will miss relevant prior art filed as part of broader cell claims.
Run a cross-class search in EurekaWatch the under-claimed structural branches
Coatings, nanotechnology applications and pulp/paper-based approaches each represent a small but distinct share of records — worth a closer look before assuming they are settled.
Surface white space in EurekaCommon questions about supercapacitor separator patents
The dataset's leading assignee holds 18 of the 270 records in scope, with the field thinning quickly after that — fifth place holds 10 and tenth place holds 7. Combined, the top five assignees account for 23.7% of all records and the top ten account for 37.8%, meaning no single player controls the field outright. The ranking covers 100 companies, most holding only a handful of families each, so there is meaningful room for new entrants with a specific structural or chemical angle.
This dataset contains 270 published records filed or granted between 2015 and the 2026 cut-off, searched against IPC class H01G with additional claim and title/abstract terms for supercapacitor separators. Filing activity peaked in 2020 at 29 records in a single year. Recent years show lower counts, but that reflects publication lag of roughly 18 months rather than declining interest — 2024, the last year treated as complete, saw filings up 30% from 2021.
Filings grew from 10 records in 2021 to 13 in 2024, a 30% increase over that span, and this is the most reliable growth read available since 2024 is the most recent complete year. Counts for 2025 and 2026 appear lower only because publication has not caught up with filing — treat those years as still filling in, not as evidence of a slowdown. The longer-term pattern shows a peak in 2020 followed by a steadier but still active filing rate.
Beyond the core H01G capacitor classification every record carries by definition, 25.2% of the 270 records also sit in H01M, covering batteries, cells and fuel cells — a sign that many separator claims are drafted alongside broader cell-level inventions. Smaller overlaps appear in non-metallic inorganic compounds (9.6%), nanotechnology applications (5.9%) and coatings (4.4%). Anyone running a freedom-to-operate search focused only on H01G risks missing separator-relevant claims filed under these adjacent classes.
The United States leads with 118 records, followed by the European Patent Office at 39 and the WIPO/PCT route at 32. India (30), Israel (10) and Canada (7) round out the offices with meaningful volume in this dataset. The concentration in the US and the PCT route suggests most serious filers are pursuing broad international protection rather than a single-jurisdiction strategy.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.